Once you know the dates, you'll get even better results if almost all cards show as PIF'd (paid in full), and only one or two cards show a balance of under 10% of those cards' credit limits.
It's going to be more challenging if you pay by mailed checks, so you also might consider paying on each card's website (that way, it's usually credited that very day.) Some take an absurdly long time to get set up, like my Citi/ Sears card, and others take about 2 minutes.
A lot of people feel that paying online is unsafe, but if you are actually on that company's site, and you see the https (instead of just http) on their URL, you should be OK. It is really less secure to mail a check these days, not to mention all the different ways that your payment can fail to get there and be posted.
* Credit is a wonderful servant, but a terrible master. * Who's the boss --you or your credit?
FICO's: EQ 781 - TU 793 - EX 779 (from PSECU) - Done credit hunting; having fun with credit gardening. - EQ 590 on 5/14/2007